A couple of my favorite XJ mods are: I like mounting a fire extinguisher on the right side A-pillar, and my maglite on the left side A-pillar.

Another one is: I made a cargo net to run across the opening in the right rear of the cargo area, it goes about half way up so you can actually use that space to stick stuff in, I just cut out part of a cargo net and screwed it into the paneling